A full year in with bad retention usually points at the first few seconds, not the whole video.
Fragrance content especially lives or dies on the hook, because nobody's searching for it, they get served it cold. Open mid-action with the bottle and a specific claim ('this one gets more compliments than anything I own') instead of an intro.
Check the retention graph on your last 10 reels, and if the cliff is at second 2 or 3, that's basically your whole problem. It's also worth pulling the top reels from the bigger fragrance accounts and reverse engineering the structure, because the format that retains in that niche is pretty consistent.